<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <script src="./lib/vue-2.4.0.js"></script>
  </head>
  <body>
    <div id="app">
      <!-- <input type="button" value="toggle" @click="toggle" /> -->
      <input type="button" value="toggle" @click="flag=!flag" />
      <h3 v-if="flag">由v-if控制</h3>
      <h3 v-show="!flag">用v-show控制</h3>
    </div>
    <script>
      var vm = new Vue({
        el: "#app",
        data: {
          flag: false
        },
        methods: {
          //   toggle() {
          //     this.flag = !this.flag;
          //   }
        }
      });
    </script>
  </body>
</html>
